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When you are a liquid and want to become a gas, you need to find a lot of energy. Once you can direct that energy into your molecules, they will start to vibrate. If they vibrate enough, they can escape the limitations of the liquid environment and become a gas. When you reach your boiling point, the molecules in your system have enough energy to become a gas. The reverse is true if you are a gas.
Water existing as a gas is called water vapor, water as a liquid we generally just refer to as water, and water as a solid is called ice. The changes from a solid to liquid to a gas or a gas to a liquid to a solid are called phase changes.When substances such as water change phase, its physical properties change, but not its chemical properties (water is always H 2 0 - 2 hydrogen atoms and 1 oxygen atom).olid to Gas: When water changes from a solid (ice) to a gas (water vapor) it goes through the process of sublimation. Liquid to Gas: When water changes from liquid water to water vapor (has) it goes through the process of evaporation.